METHODS FOR TRANSMITTING AND RECEIVING HYBRID AUTOMATIC RETRANSMIT REQUEST-ACKNOWLEDGMENT (HARQ-ACK) INDEX MAPPING AND UPLINK RESOURCE ALLOCATION FOR CHANNEL SELECTION TRANSMISSION IN INTER-BAND TIME DIVISION DUPLEX MODE, USER EQUIPMENT TO TRANSMIT HARQ-ACK, AND eNODE-B TO RECEIVE HARQ-ACK

ABSTRACT

Hybrid Automatic Retransmit ReQuest-Acknowledgment (HARQ-ACK) index mapping and uplink resource allocation is performed and controlled for channel selection transmission. A method for transmitting HARQ-ACK information to an eNode-B (eNB) by a User Equipment (UE) includes identifying KPCell as a number of downlink subframe(s) of a PCell associated with an uplink subframe and identifying KSCell as a number of downlink subframe(s) of an SCell associated with the uplink subframe; generating Discontinuous Transmission (DTX) response information for a cell having a smaller number of downlink subframes between the PCell and the SCell; generating HARQ-ACK information including the generated DTX response information and response information on data received by the UE from the eNB; and to transmitting the generated HARQ-ACK information to the eNB through the uplink subframe.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.14/942,519, filed on Nov. 16, 2015, which is a continuation of U.S.patent application Ser. No. 14/707,736, filed on May 8, 2015, now issuedas U.S. Pat. No. 9,191,93 which is a continuation of U.S. patentapplication Ser. No. 13/888,891, filed on May 7, 2013, now issued asU.S. Pat. No. 9,030,973, and claims priority from and the benefit under35 U.S.C. §119(a) of Korean Patent Application Nos. 10-2012-0049041,filed on May 9, 2012, and 10-2012-0084459, filed on Aug. 1, 2012, theentire disclosures of which are hereby incorporated by reference for allpurposes as if fully set forth herein.

BACKGROUND Field

The present disclosure relates to a method and an apparatus forcontrolling HARQ-ACK index mapping and uplink resource allocation forchannel selection transmission in an inter-band Time Division Duplex(TDD) Mode. That is, the present disclosure relates to a method ofmapping HARQ-ACK indexes, and transmitting Physical Uplink ControlCHannel (PUCCH) ACK/NACK (A/N) in a state where TDD transmission modesbetween bands are different and scheduling between subcarriers is set,and apparatuses for implementing the method, and may overcomelimitations in transmission/reception subframes.

Discussion of the Background

As communication systems have developed, various wireless terminals havebeen utilized by consumers, such as, enterprises and individuals. Acurrent mobile communication system, for example, 3GPP, Long TermEvolution (LTE), LTE-Advanced (LTE-A), and the like, may be a highcapacity communication system capable of transmitting and receivingvarious data, such as, image data, wireless data and the like, beyondproviding a sound-based service. Accordingly, there is a desire for atechnology that transmits high capacity data comparable with a wiredcommunication network. Large capacity data can be efficientlytransmitted through a plurality of Component Carriers (CCs). Meanwhile,in a Time Division Duplex (TDD) system, Transmission (Tx) and Reception(Rx) are performed using particular frequency bands, and data can betransmitted and received based on divided time slots.

According to a channel selection and PUCCH format 3 transmission methodin conventional (Release-10 (Rel-10)) Carrier Aggregation (CA) TDD, itis assumed that the number of Downlink (DL) subframes associated withPCell Uplink (UL) subframes are always the same, because Rel-10 CA TDDdefines that all serving cells have the same TDD UL-DL configuration.However, in Rel-11 in which different TDDs configurations are made indifferent carriers, additional handling is used to support the PhysicalUplink Control CHannel (PUCCH) transmission method. Accordingly, thepresent teachings disclose an additional handling method, which maysolve errors in the PUCCH transmission method that are generated in suchan environment.

That is, a method for solving problems of the conventional Rel-10channel selection transmission method generated by different PDSCH HARQtimings between a PCell and an SCell and improving the Rel-10 channelselection transmission method is needed.

SUMMARY

Exemplary embodiments of the present invention provide a method fortransmitting HARQ-ACK information to an eNode-B (eNB) by a UserEquipment, a method for receiving HARQ-ACK information from a LTE by aneNB, a LTE to transmit HARQ-ACK information to an eNB, and an eNB toreceive HARQ-ACK information from a UE.

Additional features of the invention will be set forth in thedescription which follows, and in part will be apparent from thedescription, or may be learned by practice of the invention.

An exemplary embodiment of the present invention discloses a method fortransmitting Hybrid Automatic Retransmit Request-Acknowledgment(HARQ-ACK) information to an eNode-B (eNB) by a User Equipment (UE), themethod including: identifying KPCell as a number of downlink subframe(s)of a PCell associated with an uplink subframe, and identifying KSCell asa number of downlink subframe(s) of an SCell associated with the uplinksubframe; generating Discontinuous Transmission (DTX) responseinformation for a cell, among the PCell and the SCell, having a smallernumber of downlink subframe between the PCell and the SCell using adifference between the KPCell and the KSCell, wherein the DTX responseinformation includes DTX response(s), and the difference corresponds toa number of the DTX response(s); generating HARQ-ACK informationincluding the generated DTX response information and responseinformation on data received by the UE from the eNB; and transmittingthe generated HARQ-ACK information to the eNB through the uplinksubframe.

An exemplary embodiment of the present invention discloses a method ofreceiving Hybrid Automatic Retransmit Request-Acknowledgment (HARQ-ACK)information from a User Equipment (UE) by an eNode-B (eNB), the methodincluding: receiving the HARQ-ACK information generated by the LTEthrough an uplink subframe; identifying KPCell as a number of downlinksubframe(s) of a PCell associated with an uplink subframe, andidentifying KSCell as a number of downlink subframe(s) of an SCellassociated with the uplink subframe in the HARQ-ACK information; andidentifying Discontinuous Transmission (DTX) response information for acell, among the PCell and the SCell, having a smaller number of downlinksubframe between the PCell and the SCell using a difference between theKPCell and the KSCell, wherein the DTX response information includingDTX response(s), and the difference corresponds to a number of the DTXresponse(s).

An exemplary embodiment of the present invention discloses a UserEquipment (UE) to transmit Hybrid Automatic RetransmitRequest-Acknowledgment (HARQ-ACK) information to an eNode-B (eNB), theUE including: a controller, the controller to identify KPCell as anumber of downlink subframe(s) of a PCell associated with an uplinksubframe, to identify KSCell as a number of downlink subframe(s) of anSCell associated with the uplink subframe, to generate DiscontinuousTransmission (DTX) response information for a cell, among the PCell andthe SCell, having a smaller number of downlink subframe between thePCell and the SCell using a difference between the KPCell and the KSCellwherein the DTX response information includes DTX response(s), and thedifference corresponds to a number of the DTX response(s), and togenerate HARQ-ACK information including the generated DTX responseinformation and response information on data received by the UE from theeNB; and a transmitter to transmit the generated HARQ-ACK information tothe eNB through the uplink subframe,

An exemplary embodiment of the present invention discloses an eNode-B(eNB) to receive Hybrid Automatic Retransmit Request-Acknowledgment(HARQ-ACK) information from a User Equipment (UE), the eNB including: areceiver to receive the HARQ-ACK information generated by the UE throughan uplink subframe; and a controller to identify KPCell as a number ofdownlink subframe(s) of a PCell associated with an uplink subframe, toidentify KSCell as a number of downlink subframe(s) of an SCellassociated with the uplink subframe in the HARQ-ACK information, and toidentify Discontinuous Transmission (DTX) response information for acell, among the PCell and the SCell, having a smaller number of downlinksubframe between the PCell and the SCell using a difference between theKPCell and the KSCell, wherein the DTX response information includes DTXresponse(s), the difference corresponding to a number of DTXresponse(s).

It is to be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory and areintended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate embodiments of the invention, andtogether with the description serve to explain the principles of theinvention.

FIG. 1 is a diagram illustrating an inter-band CA environment accordingto exemplary embodiments of the present invention.

FIG. 2 is a diagram illustrating CA between bands having different TDDconfigurations according to exemplary embodiments of the presentinvention.

FIG. 3 is a diagram illustrating an operation scheme of each subframebased on a transmission mode of a UE under the inter-band CA environmentaccording to exemplary embodiments of FIG. 1 and FIG. 2.

FIG. 4 is a diagram illustrating a PUCCH transmission method for channelselection transmission in CA-TDD according to exemplary embodiments ofthe present invention.

FIG. 5 is a diagram illustrating a case-A, where values of M of twocells correspond to 2:1, according to exemplary embodiments of thepresent invention.

FIG. 6 is a diagram illustrating a case-A, where values of M of twocells correspond to 2:1, according to exemplary embodiments of thepresent invention.

FIG. 7 illustrates not applying a time domain bundling for a servingcell having a number of downlink subframes associated with one uplinksubframe (referred to as M), where M=3 according to exemplaryembodiments of the present invention.

FIG. 8 illustrates applying time domain bundling according to exemplaryembodiments of the present invention.

FIG. 9 illustrates where values of M of two cells correspond to 4:1according to exemplary embodiments of the present invention.

FIG. 10 illustrates where values of M of two cells correspond to 1:0according to exemplary embodiments of the present invention.

FIG. 11 illustrates where values of M of two cells correspond to 2:0according to exemplary embodiments of the present invention.

FIG. 12 illustrates where values of M of two cells correspond to 0:1according to exemplary embodiments of the present invention.

FIG. 13 illustrates where values of M of two cells correspond to 0:2according to exemplary embodiments of the present invention.

FIG. 14 illustrates where values of M of two cells correspond to 0:4according to exemplary embodiments of the present invention.

FIG. 15 is a diagram illustrating signaling between a base station and aUE according to exemplary embodiments of the present invention.

FIG. 16 is a diagram illustrating a process performed in a UE accordingto exemplary embodiments of the present invention.

FIG. 17 is a diagram illustrating a process performed in a base stationaccording to exemplary embodiments of the present invention.

FIG. 18 is a diagram illustrating an operation process in a UE accordingto exemplary embodiments of the present invention.

FIG. 19 is a diagram illustrating configuration of a base stationaccording to exemplary embodiments of the present invention.

FIG. 20 is a diagram illustrating a configuration of a UE according toexemplary embodiments of the present invention.

Throughout the drawings and the detailed description, unless otherwisedescribed, the same drawing reference numerals will be understood torefer to the same elements, features, and structures. The relative sizeand depiction of these elements may be exaggerated for clarity,illustration, and convenience.

DETAILED DESCRIPTION

Exemplary embodiments now will be described more fully hereinafter withreference to the accompanying drawings, in which exemplary embodimentsare shown. This disclosure may, however, be embodied in many differentforms and should not be construed as limited to the exemplaryembodiments set forth therein. Rather, these exemplary embodiments areprovided so that this disclosure will be thorough and complete, and willfully convey the scope of this disclosure to those skilled in the art.Various changes, modifications, and equivalents of the systems,apparatuses, and/or methods described herein will likely suggestthemselves to those of ordinary skill in the art. Elements, features,and structures are denoted by the same reference numerals throughout thedrawings and the detailed description, and the size and proportions ofsome elements may be exaggerated in the drawings for clarity andconvenience.

Additional features of the invention will be set forth in thedescription which follows, and in part will be apparent from thedescription, or may be learned by practice of the invention.

For the purposes of the present document, the following frequently usedabbreviations apply.

-   ACK Acknowledgement-   CCE Control Channel Element-   CIF Carrier Indicator Field-   DAI Downlink Assignment Index-   DCI Downlink Control Information-   DL Downlink-   DTX Discontinuous Transmission-   eNB evolved Node B/eNode-B-   HARQ Hybrid Automatic Retransmit reQuest-   HSPA High Speed Packet Access-   LTE Long Term Evolution-   HACK Negative Acknowledgement-   PCell Primary Cell-   PCFICH Physical Control Format Indicator Channel-   PDCCH Physical Downlink Control Channel-   PDSCH Physical Downlink Shared Channel-   PHICH Physical Hybrid ARQ Indicator Channel-   PUCCH Physical Uplink Control Channel-   PUSCH Physical Uplink Shared Channel-   RI Rank Indication-   SCell Secondary Cell-   SPS Semi-Persistent Scheduling-   TDD Time Division Duplex-   UE User Equipment-   UL Uplink-   UL-SCH Uplink Shared Channel-   WCDMA Wideband Code Division Multiple Access

A method for handling PUCCH transmission based on different PDSCH HARQtimings between serving cells when cross carrier scheduling isconfigured under inter-band CA is provided.

The PUCCH transmission efficiency may be improved by applying spatialbundling or time domain bundling appropriate for differently configuredHARQ timings.

A wireless communication system may be installed to provide variouscommunication services, such as, a voice service, packet data and thelike. The wireless communication system includes a User Equipment (UE)and a Base Station (BS or eNB). Throughout the specification, the userequipment may be an inclusive concept indicating a user terminalutilized in wireless communication, and should be construed as a conceptincluding all of a User Equipment (UE) in WCDMA, LTE, HSPA and the like,and a Mobile Station (MS), a User Terminal (UT), a Subscriber Station(SS), a wireless device and the like in GSM.

In general, the base station or a cell may refer to a fixed stationcommunicating with the user equipment, and may also be referred to asanother term, such as, a Node-B, an evolved Node-B (eNB), a sector, asite, a Base Transceiver System (BTS), an access point, a relay node orthe like.

That is, throughout the specification, the BS or the cell may beconstrued as an inclusive concept indicating a partial area covered by aBase Station Controller (BSC) in CDMA, a Node B in WCDMA, an eNB orsector (site) in LTE and the like, and the concept may include variouscoverage areas, such as, a megacell, a macrocell, a microcell, apicocell, a femtocell, a communication range of a relay node and thelike.

The UE and the BS are used as two inclusive transceiving subjects usedto embody the teachings described in the specification, and may not belimited to a predetermined term or word. The UE and the BS are used astwo (uplink and downlink) inclusive transceiving subjects used to embodythe teachings described in the specification, and may not be limited toa predetermined term or word. Here, uplink (UL) refers to a connectionused for sending or uploading data from the UE to the BS, and downlink(DL) refers to a connection for receiving data from the BS by the UE.

A multiple access scheme applied to the wireless communication system isnot limited. The wireless communication system may utilize variousmultiple access schemes, such as, Code Division Multiple Access (CDMA),Time Division Multiple Access (TDMA), Frequency Division Multiple Access(FDMA), Orthogonal Frequency Division Multiple Access (OFDMA),OFDM-FDMA, OFDM-TDMA, OFDM-CDMA, and the like. Exemplary embodiments ofthe present invention may be applicable to resource allocation in anasynchronous wireless communication scheme that is advanced through GSM,WCDMA, HSPA, to be LTE and LTE-advanced, and may be applicable toresource allocation in a synchronous wireless communication scheme thatis advanced through CDMA and CDMA-2000, to be UMB. Exemplary embodimentsof the present invention may not be limited to a specific wirelesscommunication, and may be applicable to all technical fields to whichthe technical idea of the present invention is applicable.

Uplink transmission and downlink transmission may be performed based ona Time Division Duplex (TDD) scheme that performs transmission based ondifferent times, or based on a Frequency Division Duplex (FDD) schemethat performs transmission based on different frequencies.

Further, a system, such as, LTE or LTE-A, configures uplink and downlinkbased on one carrier or a pair of carriers to establish the standard.The uplink and the downlink transmit control information through controlchannels, such as, a Physical Downlink Control Channel (PDCCH), aPhysical Control Format Indicator Channel (PCFICH), a Physical HybridARQ Indicator Channel (PHICH), a Physical Uplink Control Channel (PUCCH)and the like, and configures data channels, such as, a Physical DownlinkShared Channel (PDSCH) and a Physical Uplink Shared Channel (PUSCH) andthe like to transmit the data.

Meanwhile, time points are different between the downlink and the uplinkin TDD. When there are various TDD configurations, the time points mayvary.

Table 1 below shows TDD configurations. It can be identified throughTable 1 that the respective TDD configurations have different I subframetransmission timings.

TABLE 1 Uplink-downlink configurations Uplink- Downlink- downlinkto-Uplink Config- Switch-point Subframe number uration periodicity 0 1 23 4 5 6 7 8 9 0 5 ms D S U U U D S U U U 1 5 ms D S U U D D S U U D 2 5ms D S U D D D S U D D 3 10 ms  D S U U U D D D D D 4 10 ms  D S U U D DD D D D 5 10 ms  D S U D D D D D D D 6 5 ms D S U U U D S U U D

In Table 1, an area indicated by D is the downlink and an area indicatedby U is the uplink in a radio frame corresponding to ten subframes. S isa special subframe, which has a downlink-to-uplink switch-pointperiodicity.

Further, in TDD, downlink subframes associated with each uplink subframeaccording to the uplink-downlink configurations in Table 1 are asfollows.

TABLE 2 Downlink association set index {k0, k1, . . . , kM − 1} UL-DLSubframe n Config 0 1 2 3 4 5 6 7 8 9 0 — — 6 — 4 — — 6 — 4 1 — — 7, 6 4— — — 7, 6 4 — 2 — — 8, 7, 4, 6 — — — — 8, 7, 4, 6 — — 3 — — 7, 6, 11 6,5 5, 4 — — — — — 4 — — 12, 8, 7, 11 6, 5, 4, 7 — — — — — — 5 — — 13, 12,9, 8, 7, 5, 4, 11, 6 — — — — — — — 6 — — 7 7 5 — — 7 7 —

The uplink subframe associated with the downlink subframe variesdepending on the UL-DL Config. For example, for the TDD UL-DL Config 3,subframe 2 is the uplink subframe and is associated with the downlinksubframe received before subframes 7, 6, and 11. ACK/NACK information onthe downlink subframe received before the subframes 7, 6, and 11 can betransmitted in the uplink subframe 2.

Meanwhile, when one configuration of the TDD configurations is used, theUE can know in advance the subframe direction of the downlink and theuplink. This information allows the UE to pre-predict and then performthe operation.

Meanwhile, the TDD configurations may be different for each band.However, carriers included in bands having the differently configuredTDD UL-DL configuration may be used by one UE.

FIG. 1 is a diagram illustrating an inter-band CA environment accordingto exemplary embodiments of the present invention. FIG. 1 showsdifferent TDD configurations in CA for flexible traffic loadinghandling.

Reference numeral 110 indicates a configuration of two componentcarriers, wherein CC#1 111 is a carrier having a coverage of a signaltransmitted from an eNB with high power, and CC#2 112 is a carrierhaving a coverage of a signal transmitted from the eNB with low power.CC#1 111 and CC#2 112 are included in different bands. A TDDconfiguration of CC#1 111 corresponds to 1, which is indicated byreference numeral 181, and a TDD configuration of CC#2 112 correspondsto 2, which is indicated by reference numeral 182. Meanwhile, a hot-spotarea 115 consists of the CA environment including CC#1 111 and CC#2 112.Further, reference numeral 110 can configure the CA for UEs in the CC#2coverage.

Here, the UE performing communication with the hot-spot 115 hasdifferent TDD configurations, such as, CC#1 111 and CC#2 112, and theuplink subframe and the downlink subframe may be differently configuredfor each component carrier in some subframes.

In this case, operation schemes are different for each subframeaccording to whether a transmission mode supportable by the UE is ahalf-duplex mode or a full duplex mode.

In order to avoid an interference issue with TDD systems, for example,TD-SCDMA, Mobile WiMAX and the like, coexisting in the same band,different TDD UL-DL configurations are required on the inter-band CA.

A TDD UL-DL configuration including many UL subframes can be induced ona low frequency band and the TDD UL-DL configuration including many DLsubframes can be induced on a high frequency band. Such a configurationhelps a coverage enhancement, and also influences peak throughput.

FIG. 2 is a diagram illustrating CA between bands having different TDDconfigurations according to exemplary embodiments of the presentinvention.

FIG. 2 shows different TDD UL-DL configurations on inter-band which canbe used for a traffic adaptation.

Referring to FIG. 2, the TDD configurations are same or do not conflict,are made within a band A 210 and a band B 220. Accordingly, a componentcarrier A of the band A 210 is operated with TDD configuration #1through the LTE scheme, and a component carrier B is operated with theTDD configuration #1 through the LTE-A scheme. Further, a componentcarrier C of the band B 220 is operated with TDD configuration #2through the UE-A scheme. Meanwhile, a component carrier D of the band B220 is operated through the TD-SCDMA scheme. As such, in the same band,the same TDD UL-DL configuration is made or a TDD UL-DL configurationwhich does not allow confliction is made.

In a case of the UE having the CA of component carriers B and C, the TDDconfigurations are different (that is, the UE has the inter-band CA withdifferent UL-DL configurations). According to whether the UE is in thehalf-duplex transmission mode or the full-duplex transmission mode, somesubframes are muted or simultaneous transmission/reception (Tx/Rx) isperformed as illustrated in FIG. 3 described below.

FIG. 3 is a diagram illustrating an operation scheme of each subframeaccording to a transmission mode of the UE under the inter-band CAenvironment according to exemplary embodiments of FIG. 1 and FIG. 2.CC#1 is a Primary Cell (PCell), and CC#2 is a Secondary Cell (SCell).

In reference numeral 310 of FIG. 3, when the UE supports only thehalf-duplex transmission mode, only the uplink subframes of the PCelloperates and the downlink subframes of the SCell does not operate insubframes 3 and 8 of the radio frame, that is, subframes 3 and 8 of theSCell operate as muted subframes. In reference numeral 310, thehalf-duplex transmission mode is executed so that only the downlink oruplink is operated in one of subframes 3 and 8 in which the downlink andthe uplink conflict.

On the other hand, in reference numeral 320, when the UE supports onlythe full-duplex transmission mode, both the uplink subframes of thePCell and the downlink subframes of the SCell are operated in subframes3 and 8 of the radio frame. That is, the full-duplex transmission modecan implement the uplink/downlink in each of the PCell and the SCellsince transmission and reception can be simultaneously performed. Inreference numeral 320, since the full-duplex transmission mode can beexecuted even in subframes 3 and 8 in which the downlink and the uplinkconflict, both the downlink subframes and the uplink subframes can beoperated.

In the configuration of FIG. 3, the UEs in the half-duplex transmissionmode can use a reference TDD UL-DL configuration. That is, the UE canselect (determine) information on a direction (uplink or downlink) to beselected on the conflicting subframe through information on thereference TDD UL-DL configuration. In this case, problems about HybridAutomatic Retransmit reQuest (HARQ) timing, scheduling timing and thelike are generated due to the different TDD UL-DL configurations.

FIG. 4 is a diagram illustrating a PUCCH transmission method for channelselection transmission in CA-TDD according to exemplary embodiments ofthe present invention.

In FIG. 4, M refers to the number of downlink subframes associated withone uplink subframe. DL refers to a downlink subframe and UL refers toan uplink subframe in FIG. 4.

Reference numeral 410 shows a process of PUCCH transmission through anuplink subframe which is associated with each one downlink subframe inthe PCell/SCell. The PCell/SCell means two configured CCs, but thepresent invention is not limited thereto.

A relation table employed in FDD is used. The following equation isapplied.

A={2, 3, 4}, 0≤j≤A−1, HARQ-ACK(j)   (1)

In Equation (1), the A denotes the number of resources to be allocatedfor PUCCH transmission for a channel selection transmission method.According to A, respective transport block and serving cell to HARQ-ACKmapping can be applied as shown in Table 3.

TABLE 3 Table 10.1.2.2.1-1: Mapping of Transport Block and Serving Cellto HARQ-ACK(j) for PUCCH format 1b HARQ-ACK channel selectionHARQ-ACK(j) HARQ- HARQ- HARQ- A HARQ-ACK(0) ACK(1) ACK(2) ACK(3) 2 TB1Primary cell TB1 Secondary NA NA cell 3 TB1 Serving TB2 Serving TB1Serving NA cell1 cell1 cell2 4 TB1 Primary cell TB2 Primary TB1Secondary TB2 Secondary cell cell cell

When A is 2, that is, when one CodeWord (CW) is transmitted in each ofthe PCell and the SCell, the number of required resources (A) is 2. As aresult, the one CW delivered by the PCell is allocated to theHARQ-ACK(0), and the one CW delivered by the SCell is allocated to theHARQ-ACK(1) based on Table 3. Hereafter, each CW can be interpreted as aTransport Block.

Meanwhile, when A is 3, one CW is transmitted in either the PCell or theSCell, and two CWs are transmitted in the other cell. In this case, HARQACK information on the two CWs transmitted from the cell (cell 1) isindexed by HARQ-ACK(0) and HARQ-ACK(1), to respectively, and HARQ ACK ofthe cell (cell 2) in which the one CW is transmitted is indexed byHARQ-ACK(2). For example, when the two CWs are transmitted in the PCell,the PCell becomes the cell 1 and the SCell becomes the cell 2.

When A is 4. that is, when two CWs are transmitted in each of the PCelland the SCell, the total number of desired resources (A) is 4. As aresult, information on the two CWs transmitted in the PCell is indexedby HARQ-ACK(0) and HARQ-ACK(1) and information on the two CWstransmitted in the SCell is indexed by HARQ-ACK(2) and HARQ-ACK(3),

Reference numeral 420 shows a process of PUCCH transmission through theuplink subframe associated with two downlink subframes in thePCell/SCell (2 configured CCs).

In this case, a channel selection transmission method is performed byusing A=4 resources through a mapping rule as shown in Table 4 below.

TABLE 4 Mapping of subframes on each serving cell to HARQ-ACK(j) forPUCCH format 1b HARQ-ACK channel selection for TDD with M = 2HARQ-ACK(j) HARQ- HARQ- A ACK(0) HARQ-ACK(1) ACK(2) HARQ-ACK(3) 4 Thefirst The second The first The second subframe of subframe of subframeof subframe of Primary cell Primary cell Secondary cell Secondary cell

Reference numerals 430 and 440 show a case of M>2 in the PCell/SCell.

When M=3 or 4, the channel selection transmission is performed in thefollowing way without using Tables 3 and 4 applied when M=1 or M=2.

When PDSCH transmission indicated by a PDCCH transmitted in the PCell orPDCCH indicating DL Semi-Persistent Scheduling (SPS) release is receivedin the PCell, PUCCH resources are induced by applying either processa-i) or a-ii) described below.

a-i) When there is SPS PDSCH transmission in the PCell, n_(PUCCH,0) ⁽¹⁾is indicated by using high layer signaling and a Transmit Power Control(TPC) field. In addition to the SPS PDSCH transmission in the PCell,when the PDCCH having Downlink Assignment Index (DAI)=1 is transmittedto indicate PDSCH transmission or DL SPS release, the PUCCH resource isderived through: n_(PUCCH,1)⁽¹⁾=(M−m−1)·N_(c)+m·N_(c+1)+n_(CCE,m)+N_(PUCCH) ⁽¹⁾.

In this case, A/N for the SPS PDSCH is allocated to HARQ-ACK(0).

According to j(1≤j≤M−1), a HARQ-ACK(j) indexing rule is based on a DAIvalue. For example, A/N for the PDCCH having DAI=1 is allocated toHARQ-ACK(1).

In cases of the a-ii) which is not the case as a-i), n_(PUCCH,0) ⁽¹⁾ isimplicitly derived from the PDCCH having DAI=1.

n_(PUCCH,1) ⁽¹⁾ is implicitly derived from the PDCCH having DAI=2. Thatis, in the HARQ-ACK(j) indexing, the DAI value of the PDCCH is equal toj+1 according to j(0≤j≤M−1).

When PDSCH transmission indicated by the PDCCH transmitted to the SCellis received in the SCell, a method selected from either b-i) or b-ii) isapplied.

b-i) Cross-Carrier Scheduling on PCell

n_(PUCCH,2) ⁽¹⁾ is implicitly derived from the PDCCH having DAI=1.

n_(PUCCH,3) ⁽¹⁾ is implicitly derived from the PDCCH having DAI=2.

b-ii) Self Scheduling

n_(PUCCH,2) ⁽¹⁾ and n_(PUCCH,3) ⁽¹⁾ are indicated by a combination ofhigher layer signaling and a TPC field.

In the methods b-i) and b-ii), HARQ-ACK(₁) allocation is j(0≤j≤M−1) andthe DAI value is j+1.

In FIG. 4, M values of the PCell and the SCell are the same in the CAenvironment. However, in order to improve capabilities of the Melt andthe SCell, it is required to independently configure the M values.

in the conventional (Rel-10) CA TDD, it is assumed that numbers of DLsubframes associated with one PCell UL subframe are the same in achannel selection and PUCCH format 3 transmission method, because theRel-10 CA TDD defines that all serving cells have the same TDD UL-DLconfiguration. However, Rel-11 supports different TDD configurations indifferent carriers, and additional handling is used to support the PUCCHtransmission method. Accordingly, the present disclosure provides anadditional handling method, which may solve errors in the PUCCHtransmission method which can be generated in such an environment.

The present teachings provide a method that may solve the problems ofthe conventional Rel-10 channel selection transmission method generateddue to different PDSCH HARQ timings between the PCell and the SCell.

In the prior art (Rel-10), the channel selection transmission method isdefined as an HARQ-ACK transmission method only for the CA UE having twoconfigured CCs. Particularly, unlike FDD (frame structure type 1),HARQ-ACK feedbacks to be transmitted on one UL subframe may becomegreater due to an increase in the number of DL subframes in TDD (framestructure type 2). Accordingly, in Rel-10, for the channel selectiontransmission in the TDD CA environment, several mapping rules andresource allocation rules are differently defined according to thenumber of DL subframes (that is, M values in Tables 3 and 4 above).However, as described above, when different TDD UL-DL configurations areapplied to the TDD CA environment (more accurately, due to differentPDSCH HARQ timings between the PCell and the SCell), additional handlingis provided for channel selection transmission. Table 5 illustratescase-A, case-B, and case-C; cases that are not covered by the prior art(Rel-10), and the exemplary embodiments include an additional handlingmethod for each of the case-A, the case-B, the case-C, and the case-D.

TABLE 5 Detailed embodiments to implement different PDSCH HARQ timingsbetween the PCell and the SCell M = 1 M = 2 M = 3 M = 4 for PCell forPCell for PCell for PCell M = 1 for SCell Rel-10 Case-A Case-B Case-Ccase M = 2 for SCell Case-A Rel-10 case Case-C Case-C M = 3 for SCellCase-B Case-C Rel-10 case Case-C M = 4 for SCell Case-C Case-C Case-CRel-10 case M = 0 for PCell or M = 0 for SCell: Case-D

The PCell and the SCell need additional parameters for indicatingdifferent M values. The additional parameters are defined as follows.

K_(PCell):{k_(0,Pcell), k_(1,Pcell), . . . , k_(M−1,Pcell)}

K_(SCell):{k_(0,Scell), k_(1,Scell), . . . , k_(M−1,Scell)}

The additional parameters can be parameters when the PCell and the SCellhave different M values.

In the case-A/B/C/D described below, #1 and #2 indicating serving cellsare not limited to the PCell or the SCell, but can be defined accordingto each case or by an appointment between the base station and the UE.Also, when the mapping is made with HARQ-ACK(j) according to each case,orders thereof may be inversed or changed, and the order can bevariously applied according to implementations.

Exemplary Case-A

First, a case where a ratio of the numbers of DL subframes on twoserving cells (PCell and SCell) associated with one UL subframe is 2:1is considered. HARQ-ACK(j) mapping according to a value of “A” which isthe number of PUCCH resources required for the channel selectiontransmission method in the case-A is as shown in Table 6 (Mapping ofTransport Block and Serving Cell to HARQ-ACK(j) for PUCCH format 1bHARQ-ACK channel selection in CA with different TDD configurations).

TABLE 6 A channel selection mapping table in the case-A HARQ-ACK(j)HARQ- HARQ- A HARQ-ACK(0) HARQ-ACK(1) ACK(2) ACK(3) 3 First subframe ofSecond subframe First subframe NA serving cell #1 of serving cell #1 ofserving cell #2 4 First subframe of Second subframe TB1 of serving TB2of serving cell #1 of serving cell #1 cell #2 serving cell #2

In Table 6 HARQ-ACK index for two subframes of serving cell #1 aremapped to HARQ-ACK(0) and HARQ-ACK(1), respectively. Depending onconfiguring one or two TBs for the cell (serving cell #2), HARQ-ACKindex on the downlink transmission in one subframe of the cell aremapped into HARQ-ACK(2) or HARQ-ACK(3), respectively.

In the case of M=2:1, a mapping relation between the number of PUCCHresources and a corresponding serving cell will be described.

FIG. 5 is a diagram illustrating the case-A, where values of M of twocells correspond to 2:1 according to exemplary embodiments of thepresent invention. FIG. 5 shows the case where M of the PCell is 1 and Mof the SCell is 2. Although not shown, M of the PCell could be 2 and Mof the SCell could be 1, which corresponds to an inverse case of FIG. 5.

FIG. 5 shows a case where a value of “A” which is the number of thePUCCH resources for channel selection transmission is 3 (A=3).

In the case of A=3, different correlations are made according to aTransmission (TM) mode (i.e., 1TB or 2TB transmission) configured ineach serving cell, the number of configured serving cells, and an Mvalue (see Tables 6, FIGS. 5 and 6). As illustrated in FIG. 5, in thecase of A=3, when the number of HARQ-ACK bits is 4 or more, performanceof spatial bundling is applied to DL subframes of all CCs as shown inreference numerals 520, 530, and 540. At this time, the transmission toPUCCH format 1 b is made by using a channel selection in conjunctionwith mapping table of Table 6 corresponding to A=3.

That is, in the case of A=3, when Table 6 is applied to the case-A, theserving cell (M=2) in which two downlink subframes are associated withthe uplink subframe is allocated to HARQ-ACK(0) and HARQ-ACK(1), and theserving cell (M=1) is allocated to HARQ-ACK(2). Of course, such an ordermay be inversely performed according to prearrangement. For example, inan inverse way, the serving cell (M=1) in which one downlink subframe isassociated with the uplink subframe is allocated to HARQ-ACK(0), and theserving cell (M=2) in which two downlink subframes are associated withthe uplink subframe is allocated to HARQ-ACK(1) and HARQ-ACK(2)

Accordingly, reference numerals 510, 520, 530, and 540 are expressed byTable 7 according to mapping of Table 6 corresponding to A=3.

TABLE 7 HARQ-ACK(j) resource mapping in FIG. 5 HARQ-ACK(0) HARQ-ACK(1)HARQ-ACK(2) 510 The first subframe The second subframe of The subframeof SCell SCell of PCell 520 Perform spatial Perform spatial The subframeof bundling for the first bundling for the second PCell subframe ofSCell subframe of SCell 530 Perform spatial Perform spatial Performspatial bundling for the first bundling for the second bundling for thesubframe of SCell subframe of SCell subframe of SCell 540 The firstsubframe The second subframe of Perform spatial of SCell SCell bundlingfor the subframe of PCell

Further, c-i), c-ii), c-iii), and c-iv) are methods of inducing A(=3)PUCCH resources.

c-i) When the PDSCH indicated by reception of a PDCCH in subframen−k_(Pcell,m)(k_(PCell,m) ∈ K_(PCell)) or “PDCCH indicating downlink SPSrelease” is received on the PCell, PUCCH resources can be inducedthrough an implicit resource allocation method, such as, n_(PUCCH,j)⁽¹⁾=(M−m−1)·N_(c)+m·N_(c+1)+n_(CCE,m)+N_(PUCCH) ⁽¹⁾.

When Table 6 (A=3) and the implicit resource allocation are used and thePCell has M=1, HARQ-ACK(2)=>n_(PUCCH,j=2) ⁽¹⁾ can be induced as anexample. When the PCell has M=2, two PUCCH resources can be induced fromeach of the DL subframes as following. Accordingly,HARQ-ACK(0)=>n_(PUCCH,j=0) ⁽¹⁾, HARQ-ACK(1)=>n_(PUCCH,j=1) ⁽¹⁾ can beinduced by using table 6 (A=3) and the implicit resource allocation.

c-ii) In case there is a SPS transmission on the PCell, HARQ-ACK(j) forSPS transmission on the PCell uses resources for the SPS n_(PUCCH,j)⁽¹⁾.

c-iii) When the PDSCH by PDCCH reception in subframen−k_(Scell)(k_(SCell) ∈ K_(SCell)) on the PCell is received on theSCell, the PUCCH resource is indicated by using the implicit resourceallocation method by the PDCCH received on the PCell.

c-iv) In the case where the PDSCH transmission by PDCCH reception insubframe n−k_(Scell)(K_(SCell) ∈ K_(SCell)) on the SCell is received onthe SCell, when the SCell has M=2, two explicit PUCCH resources areindicated by using a higher layer configuration and a TPC field withinDownlink (DL) Downlink control Information (DCI) regardless of the TMmode supporting one TB or two TBs. Accordingly,HARQ-ACK(0)=>n_(PUCCH,j=0) ⁽¹⁾ and HARQ-ACK(1)=>n_(PUCCH,j=1) ⁽¹⁾ can beinduced through the proposed table (A=3) and the method. Further, whenthe SCell has M=1, only one explicit PUCCH resource is indicated byusing a higher layer configuration and a TPC field within the DL DCIregardless of the mode supporting one TB or two TBs.

FIG. 6 is a diagram illustrating the case-A, where values of M of twocells correspond to 2:1, according to exemplary embodiments of thepresent invention. FIG. 6 shows a case where M of the PCell is 1 and Mof the SCell is 2. Although not shown, an inverse case of FIG. 6 mayapply, where M of the PCell is 2 and M of the SCell is 1.

In FIG. 6, a value of “A” which is the number of PUCCH resources forchannel selection transmission is 4 (A=4). Since the value of M in thePCell is 1, the downlink subframe corresponds to a case having only twoCWs in the PCell.

FIG. 6 shows a case of A=4 where a multiplexing capability of HARQ-ACKbits is compensated to apply a method of directly multiplexing withoutapplying spatial bundling to one serving cell (serving cell with M=1)even when the number of HARQ-ACK bits is larger than 4. Accordingly, DLthroughput can increase. In this case, transmission to PUCCH format 1bcan be made by using the channel selection mapping table of Table 6corresponding to A=4.

Accordingly, reference numerals 610 and 620 may be defined as in Table 8based on the mapping of Table 6.

TABLE 8 HARQ-ACK(j) resource mapping in FIG. 6 HARQ-ACK(0) HARQ-ACK(1)HARQ-ACK(2) HARQ-ACK(3) 610 Perform spatial Perform spatial The first TBof The second TB bundling for the bundling for the the subframe of ofthe subframe first subframe of second subframe the PCell of the PCellthe SCell of the SCell 620 The first The second The first TB of Thesecond TB subframe of the subframe of the the subframe of of thesubframe SCell SCell the PCell of the PCell

In this case, since A=4, tour PUCCH resources should be induced and aninduction process corresponds to d-i), d-ii), d-iii), and d-iv).

d-i) When the PCell has M=1, all HARQ-ACK bits are directly transmittedwithout applying spatial bundling as shown in FIG. 6. Accordingly,resources for HARQ-ACK(2) and HARQ-ACK(3) can be induced from PUCCHresources through the implicit resource allocation method, such as,n_(PUCCH,j=2) ⁽¹⁾=(M−m−1)·N_(c)+m·N_(c+1)+n_(CCE,m)+N_(PUCCH) ⁽¹⁾ andn_(PUCCH,j=3) ⁽¹⁾=(M−m−1)·N_(c)+m·N_(c+1)+n_(CCE,m)1N_(PUCCH) ⁽¹⁾ andthe following mapping relation.

d-ii) In the case where the PCell has M=1, when SPS transmission isreceived, HARQ-ACK(2) is indicated through the TPC field within the DLDCI and an SPS-dedicated PUCCH resource set, and HARQ-ACK(3) isindicated through n_(PUCCH,j=3) ⁽¹⁾=n_(PUCCH,j=2) ⁽¹⁾+1 for HARQ-ACK(2).

d-iii) When the PCell has M=2, resources for HARQ-ACK (j=0) andHARQ-ACK(j=1) are indicated through the implicit method of n_(PUCCH,j)⁽¹⁾=(M−m−1)·N_(c)+m·N_(c+1)+n_(CCE,m)+N_(PUCCH) ⁽¹⁾ on each downlinksubframe.

d-iv) The SCell indicates two explicit PUCCH resources by using thehigher layer configuration and the TPC field within the DL DCIregardless of M=1 or M=2.

Exemplary Case-B

Next, a case where a ratio of the numbers of DL subframes associatedwith one UL subframe is 3:1 on the DL subframe of two serving cells(PCell and SCell) will be first described (see Table 5). In the case-B,“A” which is the number of PUCCH resources for channel selectiontransmission is 4.

Hereinafter, mapping between HARQ-ACK(j) and a corresponding servingcell in the case of M=3:1 (1:3) will be described (A is the number ofPUCCH resources for channel selection transmission).

FIG. 7, FIG. 8, and FIG. 9 show the case-B. Since one uplink subframe isassociated with three downlink subframes in one serving cell in thecase-B, the time domain bundling may be considered in addition to thespatial bundling (two TBs are applied to transmitted CC) like in Rel-10.Accordingly, this disclosure describes a method of transmitting HARQ-ACKin consideration of both cases where the time domain bundling isperformed and not performed.

FIG. 7 illustrates not applying a time domain bundling for a servingcell having a number of downlink subframes associated with one uplinksubframe (referred to as M), where M=3 according to exemplaryembodiments of the present invention.

Table 9 shows an HARQ-ACK resource allocation method when M betweenserving cell is 3:1 (or 1:3).

TABLE 9 Mapping in the Case-B (Mapping of each Serving Cell toHARQ-ACK(j) for PUCCH format 1b HARQ-ACK channel selection in differentTDD configurations) HARQ-ACK(j) HARQ- HARQ- A HARQ-ACK(0) HARQ-ACK(1)ACK(2) ACK(3) 4 First subframe of Second subframe Third subframe Firstserving cell #1 of serving cell #1 of serving subframe of cell #1serving cell #2

In Table 9, three downlink subframes of the serving cell (serving cell#1) in which the three: downlink subframes are associated with theuplink subframe are mapped into HARQ-ACK(0), HARQ-ACK(1), andHARQ-ACK(2), respectively, and one downlink subframe of the serving cell(serving cell #2) in which the one downlink subframe is associated withthe uplink subframe is mapped into HARQ-ACK(3). Of course, variousmodifications, such as, mapping the three downlink subframes intoHARQ-ACK(1), HARQ-ACK(2), and HARQ-ACK(3), mapping other serving cellsinto HARQ-ACK(0), and inversely arranging the orders of Table 9 can beimplemented.

Table 10 is achieved by applying Table 9 to reference numerals 710, 720,730, and 740 of FIG. 7.

TABLE 10 HARQ-ACK(j) resource mapping in FIG. 7 HARQ-ACK(0) HARQ-ACK(1)HARQ-ACK(2) HARQ-ACK(3) 710 The first The second The third The subframeof subframe of the subframe of the subframe of the the SCell PCell PCellPCell 720 Perform spatial Perform spatial Perform spatial The subframeof bundling for the bundling for the bundling for the the SCell firstsubframe of second subframe third subframe of the PCell of the PCell thePCell 730 The first The second The third Perform spatial subframe of thesubframe of the subframe of the bundling for the PCell PCell PCellsubframe of the SCell 740 Perform spatial Perform spatial Performspatial Perform spatial bundling for the bundling for the bundling forthe bundling for the first subframe of second subframe third subframe ofsubframe of the the PCell of the PCell the PCell SCell

Meanwhile, in order to indicate PUCCH resources for the HARQ-ACK(j) inTable 10, methods e-i), e-ii), and e-iii) are applied.

e-i) When the PDSCH transmission indicated by the PDCCH transmitted onthe PCell or the PDCCH indicating downlink SPS release is received onthe PCell, PUCCH resources can be induced on each DL subframe throughthe implicit resource allocation method, such as, n_(PUCCH,j)⁽¹⁾=(M−m−1)·N_(c)+m·N_(c+1)+n_(CCE,m)+N_(PUCCH) ⁽¹⁾ and the mappingrelation shown in Table 9.

e-ii) When the PDSCH transmission indicated by the PDCCH transmitted onthe PCell is received on the SCell, PUCCH resources can be induced oneach DL subframe through the implicit resource allocation method, suchas, n_(PUCCH,j) ⁽¹⁾=(M−m−1)·N_(c)+m·N_(c+1)+n_(CCE,m)+N_(PUCCH) ⁽¹⁾ andthe mapping relation in Table 8.

e-iii) In the case of M=1, the SCell indicates one explicit PUCCHresource by using the higher layer configuration and the TPC fieldwithin the DL DCI. In the case of M=3, the SCell indicates threeexplicit PUCCH resources by using the higher layer configuration and theTPC field within the DL DCI.

FIG. 8 illustrates applying the time domain bundling according toexemplary embodiments of the present invention. Reference numeral 810corresponds to the case of applying the time domain bundling only to theserving cell having M=3, and reference numeral 820 corresponds to thecase where the time domain bundling is applied to the serving cellhaving M=1 as well as the serving cell having M=3.

In reference numeral 810, the PCell performs the time domain bundlingfor three downlink subframes and thus requires two HARQ-ACK resources.Since the SCell is one CW, the SCell requires one HARQ-ACK resource. Thecase where the SCell is two CWs in this process corresponds to thecase-C, and the SCell requires a total of four HARQ-ACK resources.

Since A is 2, the case of reference numeral 810 can be implemented in asimilar way to that of Table 6. The implementation is made as shown inTable 11. When Table 11 is applied to reference numeral 810, servingcell #1 is the PCell and serving cell #2 is the SCell. The case whereone CW is transmitted in the SCell corresponds to A=3 of Table 11, andthe case where two CWs are transmitted in the SCell corresponds to A=4of Table 11.

TABLE 11 A channel selection mapping table in the Cases-B and C (timedomain bundling is applied only to the case of M = 3) HARQ-ACK(j) HARQ-A HARQ-ACK(0) HARQ-ACK(1) HARQ-ACK(2) ACK(3) 3 Result of Time DomainBundling in First subframe NA Serving cell #1 of serving cell #2 4Result of Time Domain Bundling in TB1 of serving TB2 of Serving cell #1cell #2 serving cell #2

A more detailed description will be made below.

In reference numeral 810, the channel selection mapping tablecorresponding to A=3 of Table 3 may be used, in some embodiments, whenthe TB of the serving cell, which does not apply the time domainbundling, is in a 2-TB transmission mode, the channel selectiontransmission can be performed by using the channel selection mappingtable corresponding to A=4 of Table 3.

Two PUCCH resources are induced through the serving cell having M=3 andone or two resources are induced through another serving cell (M=1).n_(PUCCH,j=0) ⁽¹⁾ and n_(PUCCH,j=1) ⁽¹⁾ are derived from the PCell,n_(PUCCH,j=2) ⁽¹⁾ and n_(PUCCH,j=3) ⁽¹⁾ are derived from the SCell, asdescribed above. In this case, the serving cell and HARQ-ACK mappingrelation as shown in Table 9 is not used.

Reference numeral 820 shows the case of applying the time domainbundling to the serving cell having M=1 as well as the serving cellhaving M=3. In order to apply the time domain bundling to the servingcell having M=1, it is assumed that there is a virtual DL subframe. AnA/N value for the virtual DL subframe corresponds to one state amongthose including Discontinuous Transmission (DTX), Acknowledge orAcknowledgement (ACK), or Negative Acknowledgement (NACK) according toprearrangement with the base station.

In reference numeral 820, since the PCell has the M=3 number of DLsubframes and the SCell has the M=1 number of DL subframe, a time domainbundling method is applied based on a larger M value for both twoserving cells, that is, M=3. Accordingly, by virtually assuming that theserving cell (SCell in reference numeral 820) having M=1 has an M=3,there seems to be an environment where both the conventional PCell andSCell have the same M=3. Therefore, HARQ-ACK is transmitted by using thesame M=3 time domain bundling.

An associated PUCCH resource allocation method can be implementedthrough the aforementioned method.

In this case, the serving cell and HARQ-ACK mapping relation as shown inTable 9 is not used.

In reference numeral 820, it is assumed that the serving cell having asmaller M value has the M value of the serving cell having a larger Mvalue (in this case M>2). In reference numeral 820, it is assumed thatan M value of the SCell is 3.

Under this assumption, the UE may appoint or configure in advanceACK/NACK information (A/N state) of a blank subframe (or virtualsubframe), such as, reference numeral 821 or 822 as DTX or NACK/DTX.

Exemplary Case-C

In the cases which are not the case-A/B, the time domain bundling can beapplied as shown in FIG. 9. FIG. 9 illustrates where values of M of twocells correspond to 4:1 according to exemplary embodiments of thepresent invention.

FIG. 9 shows a case where a ratio of M values of two cells is one of4:1/4:2/4:3/3:2 according to exemplary embodiments of the presentinvention. In FIG. 9, the PCell performs the time domain bundling to mapinto two bits, that is, two HARQ-ACK resources. Meanwhile, in case thenumber of CW in the SCell is one or two, or when one or two subframesare transmitted, the SCell can be mapped into 1 or 2 bits. As a result,two HARQ-ACK resources are needed anyway. Additionally, when M=3 in theSCell, the time domain bundling can be performed in the SCell.

That is, the time domain bundling is applied to the cell having thelarger M value between two cells. When the M value of the other cell is3, the time domain bundling can be also applied. In some embodiments, asdescribed above, based on the method using larger M value, the currentRel-10 PUCCH A/N transmission method can be applied to two serving cellsby using the virtual DL subframe in order to make the same M valuesbetween PCell and SCell.

Exemplary Case-D

In the case-A to case-C, the M values of the PCell and the SCell are not0 and are different from each other.

Meanwhile, when a currently considered combination of HARQ timings whichcan be applied for the PCell and the SCell is considered, a case wherethere is no downlink subframe related to a particular uplink subframe onone serving cell of the PCell and the SCell, that is, a case where thereis no A/N transmission due to no PDSCH can occur. In other words, onlythe A/N for the PDCCH indicating the PDSCH transmission and the DL SPSrelease on the PCell in the particular uplink subframe is transmittedwithout those of SCell or only the A/N for the PDCCH indicating thePDSCH transmission or the DL SPS release on the SCell is transmittedwithout those of PCell.

For example, with respect to the PCell and the SCell, M=1:0, 0:1, 2:0,0:2, or 0:4. However, this case is not limited thereto.

In this case, in one example, by virtually assuming that the M value ofthe cell in which there is no downlink subframe (i.e. M=0) is the same Mvalue of the other cell in which there is the downlink subframe in asimilar way to that of reference numeral 820 of FIG. 8, so that anenvironment where the two cells have the same M value can be applied.For example, in the case of M=0 of the PCell and M=1 of the SCell, it isassumed that M=1 with respect to the PCell. Consequently, the PCell andthe SCell apply the PUCCH resource allocation method corresponding toM=1.

However, the UE and the base station can fix A/N information as DTX inthe case of M=0, and the UE is not required to report corresponding DTXinformation to the base station. In this case, a channel selectiontransmission method described below can be used.

The following technology assumes an environment where two serving cellsare configured. When cross-carrier scheduling with carrier indicatorfield (CIF) is configured on PCell, it is assumed that the PCell is ascheduling cell which performs scheduling for the cells, and the SCellis a scheduled cell which is scheduled by the scheduling cell (i.e.PCell).

Exemplary Case D-1: M=1:0

FIG. 10 illustrates M=1 of the PCell and M=0 of the SCell according toexemplary embodiments of the present invention. In this case, PUCCHformat 1a/1b can be used for HARQ-ACK transmission with respect to PDSCHtransmission on one downlink subframe on the PCell. That is, when one CWis transmitted in the PCell like in reference numeral 1010, PUCCH format1a can be used for 1 bit HARQ-ACK transmission. When two CWs aretransmitted as shown in reference numeral 1020, PUCCH format 1b can beused for 2 bit HARQ-ACK transmission. In this case, since the PDSCHtransmission is shown on the PCell, PUCCH resources can be derived froma first CCE (nCCE) to which the PDCCH (DAI=1) indicating thecorresponding PDSCH transmission is allocated. Also for the DL SPSrelease, same approach is applied for PUCCH resource derivation.

Exemplary Case D-2: M=2:0

FIG. 11 illustrates M=2 of the PCell and M=0 of the SCell according toexemplary embodiments of the present invention. In the PCell, the PDSCHtransmission to two downlink subframes can be generated.

In one example, channel selection transmission can be performed by usinga relation table between an HARQ-ACK index and a transport blocktransmitted on the serving cell of Table 12 and a channel selectionmapping table. The TB and the serving cell can be associated with theHARQ-ACK(j) index by using Table 12.

TABLE 12 A relation mapping table between HARQ-ACK index and a transportblock of the serving cell in M = 2:0 HARQ-ACK(j) HARQ- A HARQ-ACK(0)HARQ-ACK(1) HARQ-ACK(2) ACK(3) 2 First subframe Second subframe NA NA ofserving cell of serving cell #1 #1 4 TB1 of first TB2 of first TB1 ofsecond TB2 of subframe in subframe in subframe in second serving cell #1serving cell #1 serving cell #1 subframe in serving cell #1

As noted from reference numeral 1110 of FIG. 11, when one CW istransmitted in the PCell (not MIMO transmission mode), the number ofrequired PUCCH resources (A) is 2 and corresponds to A=2 of Table 12. Atotal of two PUCCH resources can be induced through nCCE of the PDCCH(DAI=1, 2) in each downlink subframe.

As noted from reference numeral 1120 of FIG. 11, when two CWs aretransmitted in the PCell (MIMO transmission mode), the number ofrequired PUCCH resources (A) is 4 and corresponds to A=4 of Table 12. Atotal of four PUCCH resources can be induced through nCCE and nCCE+1 ofthe PDCCH (DAI=1, 2) in each downlink subframe.

In some embodiments, as noted from reference numeral 1130 of FIG. 11,when two CWs are transmitted in the PCell (MIMO transmission mode), thespatial bundling is applied to each downlink subframe of the PCell andtwo HARQ-ACK bits are transmitted PUCCH format 1b. The PUCCH resourcecan be induced through nCCE of the PDCCH in each downlink subframe.

Exemplary Case D-2: M=0:1

FIG. 12 illustrates M=1 of the PCell and M=0 of the SCell according toexemplary embodiments of the present invention. In this case, PUCCHformat 1a/1b can be used for HARQ-ACK transmission with respect to thePDSCH. That is, when one CW is transmitted in the SCell as noted fromreference numeral 1210, PUCCH format 1a can be used for 1 bit HARQ-ACKtransmission. When two CWs are used as noted from reference numeral1220, PUCCH format 1b can be used for 2 bit HARQ-ACK transmission.

In a case of self-scheduling (PDSCH scheduling information of the SCellis transmitted through the PDCCH of the SCell), the PUCCH resource canbe derived from the Acknowledgement Resource Indication (ARI) reusingthe TPC field (2 bits) within the PDCCH (that is, DL DCI format) of theSCell.

In a case of cross carrier scheduling, the PUCCH resource can be derivedfrom a first CCE (nCCE) to which the PDCCH of the PCell is allocated.Meanwhile, when the PCell cannot control the PDSCH transmission to thedownlink subframe on the corresponding SCell, that is, when the subframeconfigured as the downlink by the SCell is not configured as thedownlink by the PCell, HARQ-ACK may not be transmitted.

Exemplary Case D-4: M=0:2

FIG. 13 illustrates M=0 of the PCell and M=2 of the SCell according toexemplary embodiments of the present invention. The PDSCH transmissionin two downlink subframes may be generated in the SCell.

In one example, channel selection transmission can be performed by usingthe relation between the HARQ-ACK index and the transport block of theserving cell and the channel selection mapping table. The TB and theserving cell can be associated with the HARQ-ACK(j) index by using Table12.

As noted from reference numeral 1310 of FIG. 13, when one CW istransmitted in the SCell (not MIMO transmission mode), the number ofrequired PUCCH resources is 2 and corresponds to A=2 of Table 12.

As noted from reference numeral 1320 of FIG. 13, when two CWs aretransmitted in the SCell (MIMO transmission mode), the number ofrequired PUCCH resources (A) is 4 and corresponds to A=4 of Table 12.

In some embodiments, as noted from reference numeral 1330 of FIG. 13,when two CWs are transmitted in the SCell (MIMO transmission mode),spatial bundling is applied to each downlink subframe of the SCell andtwo HARQ-ACK bits can be transmitted by PUCCH format 1b.

In the case of the self-scheduling, the PUCCH resource can be induced asfollows.

1) When two CWs are transmitted in the SCell (A=4, the SCell receivesfour resources through the ARI reusing the TPC field (two bits) withinthe PDCCH and induces a relation between the corresponding PUCCHresource and the HARQ-ACK index by using a mapping relation between thecase of A=4 of Table 12 and the HARQ-ACK index. At this time, the ARIcan indicate four PUCCH resources.

2) When one CW is transmitted in the SCell, or when two CWs aretransmitted in the SCell and spatial bundling is applied to eachdownlink subframe, the SCell receives two resources through the ARIreusing the TPC field (two bits) within the PDCCH and induces a relationbetween the corresponding PUCCH resource and the HARQ-ACK index by usinga mapping relation between the case of A=2 of Table 12 and the HARQ-ACKindex. At this time, the ARI can indicate two PUCCH resources.

In a case of cross carrier scheduling, the PUCCH resource can be inducedas follows.

1) When two CWs are transmitted in the SCell (A=4), a total of fourPUCCH resources can be induced through nCCE and nCCE+1 of the PDCCH(DAI=1, 2) of the PCell in each downlink subframe.

2) When one CW is transmitted in the SCell, or when two CWs aretransmitted in the SCell and spatial bundling is applied to eachdownlink subframe, a total of two PUCCH resources can be induced throughnCCE of the PDCCH (DAI=1, 2) of the PCell in each downlink subframe.

Meanwhile, when the PCell cannot control the PDSCH transmission to thedownlink subframe on the corresponding SCell, that is, when the subframeconfigured as the downlink by the SCell is not configured as thedownlink by the PCell, HARQ-ACK may not be transmitted.

Exemplary Case D-4: M=0:4

FIG. 14 illustrates M=0 of the PCell and M=4 of the SCell according toexemplary embodiments of the present invention. PDSCH transmission tofour downlink subframes can be generated in the SCell.

In the case of the self-scheduling, the PUCCH resource can be induced asfollows.

1) As noted from reference numeral 1410 of FIG. 14, the spatial bundlingis applied when two CWs are first transmitted in the SCell (MIMOtransmission mode), and the spatial bundling is not applied when one CWis transmitted. As shown in Table 13 below, time domain bundling isapplied to generate two HARQ-ACK bits and the generated two HARQ-ACKbits can be transmitted by using the channel selection mapping tablehaving A=2. In the case of the self-scheduling on the downlink subframecorresponding to DAI=1 or 2, indication can be made by using the ARI(the same ARI value can be transmitted through the PDCCH transmittingthe DAI=1 or 2).

TABLE 13 Time domain bundling table with M = 4 HARQ-ACK(0), HARQ-ACK(1),HARQ-ACK(2), HARQ-ACK(3) Mapped state ‘D, any, any, any’ or no DLassignment is received. D, D ‘A, D, D, D’ A, N ‘A, A, N/D, any’ N, A ‘A,A, A, N/D’ A, A ‘A, A, A, A’ A, N ‘N, any, any, any’ or ‘A, D/N, any,any except for A, N, N D, D, D’

2) As described in 1), bundled two HARQ-ACK bits can be transmitted toPUCCH format 1b.

3) As noted from reference numeral 1420 of FIG. 14, the spatial bundlingis applied when two CWs are transmitted in the SCell (MIMO transmissionmode) and the spatial bundling is not applied when one CW istransmitted. Since time domain bundling is not applied, four HARQ-ACKbits are generated by using the spatial bundling if configured by MIMOtransmission mode (i.e. 2 CW), and channel selection transmission methodcan be performed by using the mapping relation between the TB and theHARQ-ACK index corresponding to A=4 in Table 14 and the channelselection mapping table corresponding to A=4. In the case of theself-scheduling on the downlink subframe corresponding to DAI=1, 2, 3,and 4, indication can be made by using the ARI (the same ARI value canbe transmitted through the PDCCH transmitting DAI=1, 2, 3, and 4).

TABLE 14 A relation mapping table between the HARQ-ACK index and the TBof the serving cell in the case of M = 0:4 HARQ-ACK(j) HARQ- AHARQ-ACK(0) HARQ-ACK(1) HARQ-ACK(2) ACK(3) 4 first subframe secondsubframe third subframe fourth in serving in serving cell #1 in servingsubframe cell #1 cell #1 in serving cell #1

In the case of the cross carrier scheduling, the PUCCH resource can beinduced as follows.

1) As noted from reference numeral 1410 of FIG. 14, when two CWs arefirst transmitted in the SCell (MIMO transmission mode, the spatialbundling is applied and the time domain bundling is applied as shown inTable 13. Accordingly, two HARQ-ACK bits are generated and channelselection transmission can be performed by using the channel selectionmapping table corresponding to A=2. In the case of the cross carrierscheduling on the downlink subframe corresponding to DAI=1 and 2,indication can be made by using the PUCCH resource derived from the nCCEindex to which the PDCCH is allocated. In a condition where the PCellcannot schedule the PDSCH transmission to the downlink subframe on thecorresponding SCell, HARQ-ACK may not be transmitted.

2) As described in 1), bundled two HARQ-ACK bits can be transmitted toPUCCH format 1b.

3) As noted from reference numeral 1420 of FIG. 14, when two CWs aretransmitted in the SCell (MIMO transmission mode), the spatial bundlingis applied and the time domain bundling is not applied. Accordingly,four HARQ-ACK bits are generated, and channel selection transmission canbe performed by using a mapping relation between the TB corresponding toA=4 of Table 14 and the HARQ-ACK index and the channel selection mappingtable corresponding to A=4. In the case of the cross carrier schedulingon the downlink subframe corresponding to DA1=1, 2, 3, and 4, indicationcan be made by using the PUCCH resource derived from the nCCE index towhich the PDCCH is allocated. In a condition where the PCell cannotschedule the PDSCH transmission to the downlink subframe on the SCell,HARQ-ACK may not be transmitted.

The above-described example discloses, in detail, a case where M=0 ofthe PCell and M=4 of the SCell, but the M value of the SCell may be avalue larger than 2. For example, when M=3, two HARQ-ACK bits can begenerated by using the time domain bundling using Table 15 or threeHARQ-ACK bits can be generated without time domain bundling.

TABLE 15 Time domain bundling table with M = 3 HARQ-ACK(0), HARQ-ACK(1),HARQ-ACK(2) Mapped state ACK, ACK, ACK ACK, ACK ACK, ACK, NACK/DTXNACK/DTX, ACK ACK, NACK/DTX, any ACK, NACK/DTX NACK/DTX, any, anyNACK/DTX, NACK/DTX

Further, the above-described example discloses M=0 of the PCell, but acase of M=0 in the SCell can be applied.

So far, the detailed embodiments have been described to control the casewhere TDD configurations of two cells are different in an implementationof the channel selection transmission in the two cells.

FIG. 15 is a diagram illustrating signaling between a base station,shown as an eNB, and a UE according to exemplary embodiments of thepresent invention. An eNB 1510 performs a RRC configuration of a UE 1520in step S1550. In this process, two CCs are configured, channelselection is performed, and different TDD configurations are configuredfor each CC. As configured in step S1550, the UE 1520 determines PDSCHHARQ timings for the PCell and the SCell according to the TDDconfigurations in step S1560. Further, when HARQ timings of the PCelland the SCell are different, that is, when the HARQ timings of the twocells are different like in the case-A, the case-B, the case-C, and thecase-D as shown in Table 5, the TB or the subframe associated with theHARQ-ACK index is determined by applying the method described throughFIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, FIG. 11, FIG. 12, FIG.13 and FIG. 14, and Tables 6 to 15 in step S1570. That is, it isdetermined which TB or which subframe mapped into which HARQ-ACK index.Further, the PUCCH resource to which HARQ-ACK is to be allocated isinduced in step S1580. As described above, the induction of the PUCCHresource may be performed by using the implicit resource allocationmethod in which the resource is derived from the downlink subframe ofthe PCell or the explicit resource allocation method using explicitlyprovided information, such as, the higher layer signaling (higher layerconfiguration) or the TPC field within the DL DCI. The HARQ-ACK mappingand the PUCCH resource induction method are all predetermined by the eNB1510 and the UE 1520.

When the PUCCH resource is induced, a corresponding HARQ-ACK is insertedinto the induced PUCCH resource and PUCCH transmission according tochannel selection is performed in step S1590. The eNB 1510 decodesHARQ-ACK for the TB/subframe in step S1595.

FIG. 16 is a diagram illustrating a process performed in the UEaccording to exemplary embodiments of the present invention. FIG. 16describes the UE operation described through FIG. 15 in more detail.

The UE performs an RRC configuration step from the eNB, and differentTDD configurations and channel selection are made on two CCs in stepS1610. Further, it is identified whether M values for the PCell and theSCell are different on the UL subframe of the PCell in step S1620. Asshown in Table 5, the different M values correspond to the case-A, thecase-B, the case-C, and the case-D. When the M values are the same, theconventional Rel-10 scheme can be applied in step S1690.

Meanwhile, when the M values are different from each other, an M valueassociated with the UL subframe of the PCell is determined in stepS1630. The determination is for performing different channel selectionaccording to the case-A, the case-B, the case-C, and the case-D.Further, a new TB/subframe and HARQ-ACK(j) mapping relation and a newbundling rule according to the number of M values are applied in stepS1640. The embodiments described through FIG. 5, FIG. 6, FIG. 7, FIG. 8,FIG. 9, FIG. 10, FIG. 11, FIG. 12, FIG. 13 and FIG. 14, and Tables 6 to13 are applied according to the number of M values. Further, a PUCCHresource induction method according to the new mapping relation isapplied in step S1650, and PUCCH transmission on the uplink subframe ofthe PCell is performed by using the channel selection transmissionmethod through the induced PUCCH resources in step S1660.

FIG. 17 is a diagram illustrating a process performed in the eNBaccording to exemplary embodiments of the present invention.

The operation process of the eNB described through FIG. 12 will bedescribed in more detail.

The eNB controls two or more bands having different TDD configurations.Also, the eNB controls HARQ-ACK index mapping and uplink resourceallocation for channel selection transmission in the inter-band TDDtransmission scheme.

The eNB transmits TDD configuration information of a first serving celland a second serving cell to the UE in step S1710. Further, the eNBtransmits data to the UE in downlink subframes of the first serving celland the second serving cell in step S1720.

Thereafter, the eNB receives data including the response information onthe data transmitted from the first serving cell and the second servingcell through the PUCCH by the channel selection transmission in theuplink subframe from the UE in step S1730. The eNB decodes the responseinformation from the HARQ-ACK index into which the response information(ACK/NACK state) on the data transmitted in the downlink subframe of thefirst serving cell and the response information on the data transmittedin the downlink subframe of the second serving cell are mapped in stepS1740 by applying the received PUCCH mapping rule and resourceallocation rule.

Here, when the number of downlink subframes associated with the uplinksubframe in which the PUCCH is transmitted is different between thefirst serving cell and the second serving cell, the mapping rule isdetermined according to the number of associated downlink subframes ofthe first serving cell and the second serving cell, and includes themapping rule described in the embodiments of FIG. 5, FIG. 6, FIG. 7,FIG. 8, FIG. 9, FIG. 10, FIG. 11, FIG. 12, FIG. 13 and FIG. 14. Thenumber of associated downlink subframes refers to M described above.

More specifically, as illustrated in FIG. 5 and FIG. 7, when the numberof associated downlink subframes of the first serving cell is one of 2,3, and 4 and the number of associated downlink subframes of the secondserving cell is 1, two or three HARQ-ACK are mapped into the responseinformation on the data downlinked from the first serving cell and oneHARQ-ACK is mapped into the response information on the data downlinkedfrom the second serving cell according to the mapping rule.

Further, in connection with the spatial bundling, when the downlinkeddata of the first cell or the second cell is two CWs, the responseinformation of the first cell or the second cell is generated throughthe spatial bundling.

As illustrated in FIG. 6, two HARQ-ACK resources can be allocated in twoCWs. That is, when the number of associated downlink subframes of thefirst cell is one of 2, 3, and 4, the number of associated downlinksubframes of the second cell is 1, and the downlinked data of the secondcell is two CWs, the response information on the data downlinked fromthe first cell is mapped into two HARQ-ACKs and the response informationon the data downlinked from the second cell is mapped into two HARQ-ACKsaccording to mapping rule.

The time domain bundling described with reference to FIG. 8 and FIG. 9is discussed. When the number of associated downlink subframes of thefirst cell is 3 or 4 and the number of associated downlink subframes ofthe second cell is one of 1, 2, and 3, the response informationgenerated by performing the time domain bundling for the data downlinkedfrom the first cell is mapped into two HARQ-ACKs and the responseinformation on the data downlinked from the second cell is mapped intoone or two HARQ-ACKs according to the mapping rule.

Further, the virtual time domain bundling described with reference toFIG. 9 can be applied. That is, when the number of associated downlinksubframes of the first cell is 3 or 4 and the number of associateddownlink subframes of the second cell is smaller than the number ofassociated downlink subframes of the first cell, the responseinformation on the data downlinked from the second cell is generated byperforming the time bundling for the virtual downlink subframeprearranged with the eNB and the data downlinked from the second cell,and then is mapped into two HARQ-ACK.

As illustrated in FIG. 10 and FIG. 12, when the number of associateddownlink subframes of the first cell is 1 and there is no associateddownlink subframe of the second cell, one or two HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there may be no mapping relation with respect to the second cellaccording to the mapping rule.

As illustrated in FIG. 11 and FIG. 13, when the number of associateddownlink subframes of the first cell is 2 and there is no associateddownlink subframe of the second cell, two or four HARQ-ACK are mappedinto the response information on the data downlinked from the first celland there is no mapping relation with respect to the second cellaccording to the mapping rule.

As illustrated in FIG. 14, when the number of associated downlinksubframes of the first cell is larger than 2 and there is no associateddownlink subframe of the second cell, two or four HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there is no mapping relation with respect to the second cellaccording to the mapping rule.

Meanwhile, the resource allocation rule for allocating PUCCH resourcesto include three or four HARQ-ACKs can use the implicit resourceallocation method and the explicit resource allocation method. Two ormore PUCCH resources are calculated through the implicit resourceallocation method using information extracted when the PDCCH receptionis performed in the downlink subframe of the PCell between the firstcell or the second cell, and one or more PUCCH resources are calculatedthrough the explicit resource allocation method by providing a TPC valuewithin the DL DCI of the SCell between the first cell and the secondcell.

The first cell and the second cell can be the PCell and the SCell,respectively, or inversely the first cell and the second cell can be theSCell and the PCell, respectively. The HARQ-ACK(j) index mapping in theembodiments of FIG. 5, FIG. 6, FIG. 7, FIG. 8 and FIG. 9, and Tables 6to 11 are exemplary embodiments of the present invention. Theseembodiments can be variously implemented according to the configurationsof the eNB and the UE in the index mapping and PUCCH resourceallocation.

FIG. 18 is a diagram illustrating an operation process in the UEaccording to exemplary embodiments of the present invention.

The UE is connected to the eNB controlling two or more bands havingdifferent TDD configurations. The UE performs the HARQ-ACK index mappingand the uplink resource allocation for channel selection transmission inthe inter-band TDD transmission scheme.

The UE receives TDD configuration information of the first serving celland the second serving cell from the eNB in step S1810. Also, the UEreceives data downlinked in the downlink subframes of the first servingcell and the second serving cells from the eNB in step S1820.

The UE maps response information (ACK/NACK state) on data received inthe downlink subframe of the first serving cell and response informationon data received in the downlink subframe of the second serving cellinto three or four HARQ-ACK indexes in step S1830. This process has beendescribed with reference to FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG.10, FIG. 11, FIG. 12, FIG. 13 and FIG. 14.

Further, the UE calculates a resource of the Physical Uplink controlCHannel (PUCCH) to include the mapped HARQ-ACK in step S1840, andinserts the three or four HARQ-ACKs into the calculated PUCCH resourceand transmits the PUCCH to the eNB through the channel selectiontransmission in step S1850.

Here, the number of downlink subframes associated with the uplinksubframe in which PUCCH is transmitted is different between the firstserving cell and the second serving cell, and the response informationon the downlinked data and the HARQ-ACK index mapping are determinedbased on the number of associated downlink subframes of the firstserving cell and the second serving cell.

More specifically, as illustrated in FIG. 5 and FIG. 7, when the numberof associated downlink subframes of the first cell is one of 2, 3, and 4and the number of associated downlink subframes of the second cell is 1,two or three HARQ-ACKs are mapped into the response information on thedata downlinked from the first cell and one HARQ-ACK is mapped into theresponse information on the data downlinked from the second cell.

Further, in connection with the spatial bundling, when the downlinkeddata of the first cell or the second cell is two CWs, the responseinformation of the first cell or the second cell is generated throughthe spatial bundling.

As illustrated in FIG. 6, two HARQ-ACK resources can be allocated in twoCWs. When the number of associated downlink subframes of the first cellis one of 2, 3, and 4, the number of associated downlink subframes ofthe second cell is 1, and the downlinked data of the second cell is twoCWs, two HARQ-ACKs are mapped into the response information on the datadownlinked from the first cell and two HARQ-ACKs are mapped into theresponse information on the data downlinked from the second cell.

The time domain bundling described with reference to FIG. 8 and FIG. 9will be discussed. When the number of associated downlink subframes ofthe first cell is 3 or 4 and the number of associated downlink subframesof the second cell is one of 1, 2, and 3, two HARQ-ACKs are mapped intothe response information generated by performing the time domainbundling for the data downlinked from the first cell and one or twoHARQ-ACKs are mapped into the response information on the datadownlinked from the second cell.

Further, the virtual time domain bundling described with reference tothrough FIG. 9 can be applied. When the number of associated downlinksubframes of the first cell is 3 or 4 and the number of associateddownlink subframes of the second cell is smaller than the number ofassociated downlink subframes of the first cell, two HARQ-ACK are mappedinto the response information generated by performing the time domainbundling for the virtual downlink subframe prearranged with the eNB andthe data downlinked from the second cell.

As illustrated in FIG. 10 and FIG. 12, when the number of associateddownlink subframes of the first cell is 1 and there is no associateddownlink subframe of the second cell, one or two HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there may be no mapping relation with respect to the second cellaccording to the mapping rule.

As illustrated in FIG. 11 and FIG. 13, when the number of associateddownlink subframes of the first cell is 2 and there is no associateddownlink subframe of the second cell, two or four HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there is no mapping relation with respect to the second cellaccording to the mapping rule.

As illustrated in FIG. 14, when the number of associated downlinksubframes of the first cell is larger than 2 and there is no associateddownlink subframe of the second cell, two or four HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there is no mapping relation with respect to the second cellaccording to the mapping rule.

Meanwhile, the resource allocation rule for allocating PUCCH resourcesto include three or four HARQ-ACKs can use the implicit resourceallocation method and the explicit resource allocation method. Incalculating the PUCCH resources to include the mapped HARQ-ACK, two ormore PUCCH resources are calculated through the implicit resourceallocation method using information extracted when the PDCCH receptionis performed in the downlink subframe of the PCell between the firstcell or the second cell, and one or more PUCCH resources are calculatedthrough the explicit resource allocation method by using a higher layerconfiguration from the eNB or a TPC value within the DL DCI of the SCellbetween the first cell and the second cell.

The first cell and the second cell can be the PCell and the SCell,respectively, or inversely the first cell and the second cell can be theSCell and the respectively. The HARQ-ACK(j) index mapping in theembodiments of FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, FIG. 11,FIG. 12, FIG. 13 and FIG. 14 and Tables 6 to 14 are exemplaryembodiments of the present invention. The present invention can bevariously implemented according to the configurations of the eNB and theUE in the index mapping and PUCCH resource allocation.

FIG. 19 is a diagram illustrating a configuration of the eNB accordingto exemplary embodiments of the present invention.

An eNB 1900 controls two or more bands having different TDDconfigurations. Also, the eNB controls the HARQ-ACK index mapping andthe uplink resource allocation for channel selection transmission in theinter-band TDD transmission scheme.

The eNB 1900 includes a transmitter 1910, a controller 1920, and areceiver 1930.

The transmitter 1910 transmits TDD configuration information of thefirst serving cell and the second serving cell to the UE, and transmitsdata to the UE in downlink subframes of the first serving cell and thesecond serving cell. The receiver 1430 receives data including theresponse information on the data transmitted from the first serving celland the second serving cell through the PUCCH by the channel selectiontransmission in the uplink subframe from the UE.

The controller 1920 decodes the response information from three or fourHARQ-ACK indexes into which the response information (ACK/NACK state) onthe data transmitted in the downlink subframe of the first serving celland the response information on the data transmitted in the downlinksubframe of the second serving cell are mapped in step S1740 by applyingthe received PUCCH mapping rule and resource allocation rule.

Here, when the number of downlink subframes associated with the uplinksubframe in which the PUCCH is transmitted is different between thefirst serving cell and the second serving cell, the mapping rule isdetermined according to the number of associated downlink subframes ofthe first serving cell and the second serving cell, and includes themapping rule described in the embodiments of FIG. 5, FIG. 6, FIG. 7,FIG. 8 and FIG. 9.

More specifically, as illustrated in FIG. 5 and FIG. 7, when the numberof associated downlink subframes of the first serving cell is one of 2,3, and 4 and the number of associated downlink subframes of the secondserving cell is 1, two or three HARQ-ACKs are mapped into the responseinformation on the data downlinked from the first serving cell and oneHARQ-ACK is mapped into the response information on the data downlinkedfrom the second serving cell according to the mapping rule.

Further, in connection with the spatial bundling, hen the downlinkeddata of the first cell or the second cell is two CWs, the responseinformation of the first cell or the second cell is generated throughthe spatial bundling.

As illustrated in FIG. 6, two HARQ-ACK resources can be allocated in twoCWs. That is, when the number of associated downlink subframes of thefirst cell is one of 2, 3, and 4, the number of associated downlinksubframes of the second cell is 1, and the downlinked data of the secondcell is two CWs, the response information on the data downlinked fromthe first cell is mapped into two HARQ-ACKs and the response informationon the data downlinked from the second cell is mapped into two HARQ-ACKsaccording to mapping rule.

The time domain bundling described through FIG. 8 and FIG. 9 isdiscussed. When the number of associated downlink subframes of the firstcell is 3 or 4 and the number of associated downlink subframes of thesecond cell is one of 1, 2, and 3, the response information generated byperforming the time domain bundling for the data downlinked from thefirst cell is mapped into two HARQ-ACKs and the response information onthe data downlinked from the second cell is mapped into one or twoHARQ-ACKs according to the mapping rule.

Further, the virtual time domain bundling described through FIG. 9 canbe applied. That is, when the number of associated downlink subframes ofthe first cell is 3 or 4 and the number of associated downlink subframesof the second cell is smaller than the number of associated downlinksubframes of the first cell, the response information on the datadownlinked from the second cell is generated by performing the timebundling for the virtual downlink subframe prearranged with the eNB andthe data downlinked from the second cell and then is mapped into twoHARQ-ACKs.

As illustrated in FIG. 10 and FIG. 12, when the number of associateddownlink subframes of the first cell is 1 and there is no associateddownlink subframe of the second cell, one or two HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there may be no mapping relation with respect to the second cellaccording to the mapping rule.

As illustrated in FIG. 11 and FIG. 13, when the number of associateddownlink subframes of the first cell is 2 and there is no associateddownlink subframe of the second cell, two or four HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there is no mapping relation with respect to the second cellaccording to the mapping rule.

As illustrated in FIG. 14, when the number of associated downlinksubframes of the first cell is larger than 2 and there is no associateddownlink subframe of the second cell, two or four HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there is no mapping relation with respect to the second cellaccording to the mapping rule.

Meanwhile, the resource allocation rule for allocating PUCCH resourcesto include three or four HARQ-ACKs can use the implicit resourceallocation method and the explicit resource allocation method. Two ormore PUCCH resources are calculated through the implicit resourceallocation method using information extracted when the PDCCH receptionis performed in the downlink subframe of the PCell between the firstcell or the second cell, and one or more PUCCH resources are calculatedthrough the explicit resource allocation method by providing a TPC valuewithin the DL DCI of the SCell between the first cell and the secondcell.

The first cell and the second cell can be the PCell and the SCell,respectively, or inversely the first cell and the second cell can be theSCell and the PCell, respectively.

The HARQ-ACK(j) index mapping in the exemplary embodiments of FIG. 5,FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, FIG. 11, FIG. 12, FIG. 13 andFIG. 14, and Tables 6 to 14 are exemplary embodiments of the presentinvention. The present invention can be variously implemented accordingto the configurations of the eNB and the UE in the index mapping andPUCCH resource allocation.

FIG. 20 is a diagram illustrating a configuration of the UE according toexemplary embodiments of the present invention.

A UE 2000 is connected to the eNB controlling two or more bands havingdifferent TDD configurations. The UE performs the HARQ-ACK index mappingand the uplink resource allocation for channel selection transmission inthe inter-band TDD transmission scheme.

The UE 2000 includes a transmitter 2010, a controller 2020, and areceiver 2030.

The receiver 2030 receives TDD configuration information of the firstserving cell and the second serving cell from the eNB, and receives datadownlinked in the downlink subframes of the first serving cell and thesecond serving cells from the eNB.

The controller 2020 maps response information (ACK/NACK state) on datareceived in the downlink subframe of the first serving cell and responseinformation on data received in the downlink subframe of the secondserving cell into three or four HARQ-ACK indexes. Further, controller2020 calculates a resource of the PUCCH to include the mapped HARQ-ACKand inserts three or four HARQ-ACKs into the calculated PUCCH resource.

Further, the transmitter 2010 transmits the PUCCH to the eNB through thechannel selection transmission.

Here, the number of downlink subframes associated with the uplinksubframe in which the PUCCH is transmitted is different between thefirst serving cell and the second serving cell, and the responseinformation on the downlinked data and the HARQ-ACK index mapping aredetermined based on the number of associated downlink subframes of thefirst serving cell and the second serving cell.

More specifically, as illustrated in FIG. 5 and FIG. 7, when the numberof associated downlink subframes of the first cell is one of 2, 3, and 4and the number of associated downlink subframes of the second cell is 1,two or three HARQ-ACKs are mapped into the response information on thedata downlinked from the first cell and one HARQ-ACK is mapped into theresponse information on the data downlinked from the second cell.

Further, in connection with the spatial bundling, when the downlinkeddata of the first cell or the second cell is two CWs, the responseinformation of the first cell or the second cell is generated throughthe spatial bundling.

As illustrated in FIG. 6, two HARQ-ACK resources can be allocated in twoCWs. When the number of associated downlink subframes of the first cellis one of 2, 3, and 4, the number of associated downlink subframes ofthe second cell is 1, and the downlinked data of the second cell is twoCWs, two HARQ-ACKs are mapped into the response information on the datadownlinked from the first cell and two HARQ-ACKs are mapped into theresponse information on the data downlinked from the second cell.

The time domain bundling described through FIG. 8 and FIG. 9 will bediscussed. When the number of associated downlink subframes of the firstcell is 3 or 4 and the number of associated downlink subframes of thesecond cell is one of 1, 2, and 3, two HARQ-ACKs are mapped into theresponse information generated by performing the time domain bundlingfor the data downlinked from the first cell and one or two HARQ-ACKs aremapped into the response information on the data downlinked from thesecond cell.

Further, the virtual time domain bundling described through FIG. 9 canbe applied. When the number of associated downlink subframes of thefirst cell is 3 or 4 and the number of associated downlink subframes ofthe second cell is smaller than the number of associated downlinksubframes of the first cell, two HARQ-ACKs are mapped into the responseinformation generated by performing the time domain bundling for thevirtual downlink subframe prearranged with the eNB and the datadownlinked from the second cell.

As illustrated in FIG. 10 and FIG. 12, when the number of associateddownlink subframes of the first cell is 1 and there is no associateddownlink subframe of the second cell, one or two HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there may be no mapping relation with respect to the second cellaccording to the mapping rule.

As illustrated in FIG. 11 and FIG. 13, when the number of associateddownlink subframes of the first cell is 2 and there is no associateddownlink subframe of the second cell, two or four HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there is no mapping relation with respect to the second cellaccording to the mapping rule.

As illustrated in FIG. 14, when the number of associated downlinksubframes of the first cell is larger than 2 and there is no associateddownlink subframe of the second cell, two or four HARQ-ACKs are mappedinto the response information on the data downlinked from the first celland there is no mapping relation with respect to the second cellaccording to the mapping rule.

Meanwhile, the resource allocation rule for allocating PUCCH resourcesto include three or four HARQ-ACKs can use the implicit resourceallocation method and the explicit resource allocation method. Incalculating the PUCCH resources to include the mapped HARQ-ACK, two ormore PUCCH resources are calculated through the implicit resourceallocation method using information extracted when the PDCCH receptionis performed in the downlink subframe of the PCell between the firstcell or the second cell, and one or more PUCCH resources are calculatedthrough the explicit resource allocation method by using a higher layerconfiguration from the eNB or a TPC value within the DL DCI of the SCellbetween the first cell and the second cell.

The first cell and the second cell can be the PCell and the SCell,respectively, or inversely the first cell and the second cell can be theSCell and the PCell, respectively.

The HARQ-ACK(j) index mapping in the exemplary embodiments of FIG. 5,FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, FIG. 11, FIG. 12, FIG. 13 andFIG. 14, and Tables 6 to 14 are exemplary embodiments of the presentinvention. The embodiments can be variously implemented according to theconfigurations of the eNB and the UE in the index mapping and PUCCHresource allocation.

When the methods provided by the exemplary embodiments is applied, it ispossible to improve the transmission efficiency by solving the PUCCHtransmission method problem generated due to different PDSCH HARQtimings in the LTE Rel-11 inter-band A TDD system.

Unlink the conventional same TDD UL-DL configuration among all UEsallowing CA, these embodiments may allow PUCCH A/N transmission when thePCell and the SCell have different PDSCH HARQ timings in a state wheredifferent TDD UL-DL configurations are possible when CCs are aggregatedon different bands.

As disclosed, it may be possible to support a more stable and improvedchannel selection transmission method in an inter-band condition wheredifferent TDD configurations are made.

The embodiments of the present invention are merely for describing thetechnical idea of the present invention, but various modifications andchanges can be made by those skilled in the art without departing fromessential characteristics of the present invention. Accordingly, theembodiments disclosed in the present invention do not limit but describethe technical idea of the present invention, and the scope of thetechnical idea of the present invention is not limited by theembodiments. The protection range of the present invention should beconstrued by the appended claims and all technical ideas within anequivalent range thereof should be construed as being included in thescope of the present invention.

While the exemplary embodiments have been shown and described, it willbe understood by those skilled in the art that various changes in formand details may be made thereto without departing from the spirit andscope of this disclosure as defined by the appended claims and theirequivalents. Thus, as long as modifications fall within the scope of theappended claims and their equivalents, they should not be misconstruedas a departure from the scope of the invention itself.

1. A method for transmitting Hybrid Automatic RepeatRequest-Acknowledgment (HARQ-ACK), the method comprising: setting Npieces of HARQ-ACK to Discontinuous Transmission (DTX) for a cell, basedon a difference between KPCeli and KSCell, the difference beingassociated with the number N; generating the HAJZQ-ACK comprising the Npieces of HARQ-ACK set to DTX; and transmitting the HARQ-ACK to a BaseStation.
 2. A User Equipment (UE) for transmitting Hybrid AutomaticRepeat Request-Acknowledgment (HARQ-ACK), the UE comprising: acontroller configured to: set N pieces of HARQ-ACK to DiscontinuousTransmission (DTX) for a cell, based on a difference between KPCeli andKSCell, the difference being associated with the number N, and generatethe HARQ-ACK comprising the N pieces of HARQ-ACK set to DTX; and atransmitter configured to transmit the HARQ-ACK to a Base Station.